I think it was HotRod magazine that a few years ago did a piece on a turbo'd 350 on propane that got a reliable 650 HP. I used to drive a Propane converson Chevy 1 ton on propane. Metering wasn't very scientific or highly calibrated. To start it on a cold day you simply held an electric button down for two seconds which dumped propane into the intake then hit the starter. Once it fired it ran great without hesitation. No compensation for temp or anything. Propane burns a little hotter than gasoline and is not at all as finicky with it's mixture ratio's.
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